WARNING GRAPHIC!!!
So, while we're on the subject I thought I'd post a couple of pictures of the injury that one of my son's classmates sustained at university last year. They were at the student pub having a couple of post final exam pops and then were leaving. The injured fellow opened the exit door with a straight arm that unfortunately contacted the wire reinforced glass panel in the door which broke and his arm went through. WARNING very graphic and very gruesome pictures of before and after suturing. The guy suffered severe nerve and tendon damage, yes that is severed tendon sticking up in the first picture. You're only seeing a fraction of the stitches that were put into this guys arm, most are internal. He has more or less full functional use of his arm and hand with some permanent numbness/loss of feeling from the nerve damage. Lesson learned - use the door handle to open doors whenever possible.
I'm posting these not to be totally gruesome but rather to warn people to be careful - these sorts of injuries are not uncommon with doors of this kind and the building code no longer permits these doors, however, there is no requirement to remove existing doors which are in public buildings all over the place.
Mods, if you think these are too graphic then by all means remove them.